Large house:1. Cover a piece of foam core or cardboard with parchment paper (wrap like a present to cover 1 side). This will keep things from sticking! Next, make the "glue" that's gonna hold everything together. Mix the powdered sugar with the water, until it forms a very thick almost pastey glue. You don't want it runny like Elmer's, but thicker like ketchup. If you need to add more water, do so a little water at a time, until it combines.
2. Transfer your sugar glue to a squeeze bottle. To construct a larger house, you'll need to glue some pieces together first. You'll need 10 unbroken crackers to build 4 walls. Take 2 crackers and glue them together by putting a line of sugar glue between them, then laying them side by side and putting another line of glue over the seam. Wait about 5 minutes before turning them over to put another line of glue on the opposite sides seam.
3. Do the same for all 4 walls. For 2 of the 4 walls, you'll need to cut out some triangles so you don't have gaping holes in your walls. Do this by "sawing" your cracker very gently with a serrated steak knife, paying particular attention to the corners which crumble easily. Glue the triangles onto the tops of 2 of the walls in the same manner as before. Make sure to wait at least 10 minutes before moving them so the glue has time to set completely.
4. Next, I would recommend decorating your wall before you assemble your house. Decorate wall with candies and sugar glue, as desired. Once the decorations have set, put together the walls by putting a line of glue on 1 wall and positioning it at a 45 degree angle to an adjacent wall. Naturally, walls with triangles will be on opposite sides. Lastly, use 1 1/2 crackers (lengthwise) to build your roof.
5. Build roof by gluing lines on 1 cracker to fit onto the bottom of 1 side of the roof, using the triangles as support, then gluing the 1/2 piece on top of that. Then, do the opposite side of the roof in the same manner. Don't worry too much about the seams not looking neat or matching up perfectly, as you can cover them up with more glue and candies.
Little Houses:
1. Break whole graham crackers in 1/2 to form squares. I would recommend scoring them with the serrated knife (gentle sawing motion), before breaking them.
2. The hardest part is cutting the triangles, which you'll do in the same manner as the large ones, just on a smaller scale. I've been lazy in the past, and just left them open, covering them later with candy canes; mini ones are great.
3. With these little guys, you can start assembling soon after you finish decorating, they should only take a few minutes to set. Once fully assembled, wait 10 minutes before handling.
For more picture instructions, you can go to my blog, VegSpinz. Happy Holidays!
Source of recipe: I wanted to make gingerbread houses, but didn't want to fuss with the actual gingerbread. I also needed to make a "royal icing" that didn't have any eggs in it. This is what I came up with.

Kayleigh, Keebler has a honey-free graham. Not the healthiest things, but they fit the bill.

Spinz, Checked out your more detailed steps on your blog; nothing short of amazing. I'm in AWE that you have the patience for this. I once made one of these in elementary school, and loved it so much I didn't want to throw it out -- EVER. You've reawakened a wonderful memory in me, and, quite possibly the desire to do it all over again. Thank you! Your "houses" are truly beautiful. How LONG did it take you to akae the ones in the picture??